Mounting coupler



FIG. 1 is a front perspective view of mounting couplers according to my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is another perspective view thereof;

FIG. 4 is a further perspective view thereof;

FIG. 5 is another elevational view thereof;

FIG. 6 is a still further perspective view thereof; and,

FIG. 7 is still another perspective view thereof. 

CLAIM The ornamental design for the mounting coupler, as shown. 